babyish

the word 'babyish' is a transparent english formation, combining the native root 'baby' with the productive adjectival suffix '-ish'. the term 'baby' itself is of middle english origin, likely derived from imitative infant babbling, reflecting its core meaning of a very young child. the suffix '-ish' has germanic roots, traceable to old english '-isc', which was used to form adjectives indicating origin or character. therefore, the literal construction 'having the qualities of a baby' directly and logically yields the modern meaning of being childish or immature.

Structure: baby (infant) + ish (having the qualities of) baby (origin: middle english, from imitative babbling sounds; functional role: root noun denoting a very young child) + ish (origin: old english -isc; functional role: suffix forming adjectives meaning 'of the nature of' or 'belonging to')